Telescoping vibratory concrete screed



Nov. 14, 1961 E. E. NAVE TELESCOPING VIBRATORY CONCRETE SCREED Fileci Sept. 24, 1956 3 Sheets-Sheet 1 w m wru R INVENTOR. 592/. f0 WARD Nnv:

E. E. NAVE TELESCOPING VIBRATORY CONCRETE SCREED Nov. 14, 1961 3 Sheets-Sheet 2 Filed Sept. 24, 1956 INVENTOR.

y m m m W 7 m. P h m 1961 I E. E. NAVE 08,388

IELESCOPING VIBRATORY CONCRETE SCREED Filed Sept. 24, 1956 3 Sheets-Sheet 3 FIG-4 FIG-5 FIG-8 FIG- 7 INVENTOR.

5424 fan 40a Mm- BY $4M United. States Patent This invention relates to and in general has for its object the provision of a longitudinally adjustable vibrating concrete screed; I

More specifically, the objectof this invention is the provision of a screed including: a beam consisting of parallel, longitudinally adjustable, overlapping beam sections; trucks supporting theends of said beam; means for quickly adjusting theheight of said trucks to thereby ad just the elevation of said beam; a vibrator mounted directly on said beam; and a motor indirectly mounted on said beam through the intermediary of cushioning means. I

Another object ofthis invention is the provision of a screed of the character above described wherein its said trucks consist of a cross-member secured to each end of said beams'ydepending legs pivoted to the ends of said cross-members and provided at their lower ends with wheels; and a linkageconnecting the legs of each truck for spreading Y or contracting them to thereby independently vary the elevation of eachlend of said beam.

Still another object of this invention is the provision of a screed'of the character above described wherein its beam sections are interconnected to a common intermediatechannelp The invention possessesother advantageous features, some of which, with the foregoing, will'be set forthat length-in the following description where that form of the invention which has been selected for illustration in the drawings accompanying and forming a part of the present specification, is outlined in full. In said. drawings, one form'of the invention is shown, but his to be'understood that it is not limited to such form, since the invention as set forth inthe claims may be embodied in other forms.

Referring to the drawings: 1

FIG. 1 is a side-elevation of a screed embodying the objects of my invention. 7

FIG. 2 is a fragmentary top'plan view of the screed illustrated in FIG. 1 as viewed along the line 2-2 of FIG. 1.

FIG. 3 is a left end elevation of the screed as viewed along the line 3-3 of FIG. 1.

FIG. 4 is a vertical section taken on the section line 4-4 of FIG. 1.

FIG. 5 is a vertical section takenon'the section line 55 of FIG. 1.; y

FIG. 6 is a vertical section taken on the section line of FIG. 1.

FIG. 7 isa view similar to that illustrated in FIG. 3 but showing the screed in an'inoperative, partiallyelevated position.

.FIG. 8 is a side elevation of the structure illustrated in FIG. 7.

. FIG. 9 is a fragmentary vertical section taken on the section line 9-9 of FIG. 5. 1

FIG. 10 is a vertical section taken ongthe section line 10-10 of FIG. 9.

The screed as shown inthese various figures comprises a central channel 1, including sides 2 and 3, outwardly extending flanges 4 and 5, and a bottom or web 6. Welded to the channel sides 2 and 3, adjacent the flange "ice bottom 6, are longitudinally spaced, axially aligned pairs of outwardly extending spacing collars 7.

Secured to the collars' '7 bybolts 8 is a pair of parallel; I

overlapping beam sections 9 and 11 provided at their lower ends with'coplanar flanges or feet 12and each provided with a central upstanding web 13. Welded to the upper edge of each of the webs 13 is a pipe section 14, each of these sections being nested in thecorners formed by the channel-sides and channel flanges. Each of the beam section webs 13 is provided with a series of longitudinally spaced holes 14a (FIG. 1) for the selective accommodation of the bolts 8, this expedient serving as a means for securing the tWo beam sections in any desired degree of overlapping relationship, thereby to adjust the length of the beam constituted by the two beam sections 9 and 11. Conveniently, the beams 9- and 11 can be made from I beams by-merely' cutting off their upper flanges, substituting-'apip'e section therefor. More specifically, and as best illustrated in FIGS. 4 and 5, the two beam sections 9 and 11 are disposed in parallelism with each other and with their overlapping portions disposed alongside each other and secured to eachother by means of the intervening central channel so as to form in effect, a unitary, rigid beam, the over all length of which depends upon the extent to which the beam sections 9 and 11 are overlapped.

Overlying the channel 1 and seated on its flanges'4 and 5 is an elongated plate 15 of a length substantially shorter than the length of-each of the beam sections 9 and 11, but substantially equal in length to the length of the channel 1. Extending through the plate 15 and the channel flanges 4 and 5, along the length thereof, are bolts 16, and fastened thereto by nuts 17 are angleiron' clips'18, this'structure' serving as clamps for anchoring theplate to the channel 1 and also for securing the pipe sections 14 to thechannel corners. V I

Fastened to the free end of each of the-pipe sections 14 is a clamp 21 (FIGS. 1, 4, and 8), and bolted to the upper faces thereof isan outwardly extending bracket 22. Bolted to the outer end of each bracket 22, intermediate its ends, is a cross-beam or member generally designated by the reference numeral 23'. Each of the cross-beams 23 includes a pair of parallel bars 24 welded intermediate their ends to transverse spacing bars 25. Pivoted to the free ends of the cross-arm 23 by pins 26 are depending trunnion or wheel legs generally designated by the reference numeral 27 and each including a pair of spaced parallel bars or straps 28. Secured to and bridging each pair of'parallel straps 28 is a pin 29, and journaled thereon is a flanged trunnion or wheel 31 arranged fortraction on atrack 32. Pivoted to each of the pins 29 is a U-shaped member 33 including a crossweb 34 arranged to ride over the adjacent track 32, and therefore serving as a scraper for clearing the track of concrete. Straddling the spacing bars 25, and welded thereto intermediate theirends, is a'depending'bracket' 35, and journaled therein is a pin 36. Welded to said pin 36 on one side of the bracket 35 is a crank arm 37, and similarly welded to said pin on the opposite side of the bracket is an oppositely extending. crank armj38. Also afiixed to the outer .free end of the pin 36 is an'operating Pivoted to the outer end of, the crank arm 37 by a pin 42 i is an elbowedlink 43,, the free end of this link being pivoted to one of th ejle gs 27 by a pin 44. Similarly, an elbowed link 45 ispivotedlat its inner end to the crank arm 38 by a pin 46 and is pivoted at its outer end to the other leg 27 by a pin 47. Here it should'be noted that the links 43 and '45 are maintained in their proper 3 a planes by spacing sleeves48 and 4-9 mounted on the pins 44 and 47 between each pair of legs traps 28 As a result of this Construction, it will be seen that if the operating lever 39 be moved to the left as viewed in'FIG. 7, the free or lower ends of the truck legs 27 will be forced inwardly to thereby raise the truck and the beam section 13' connected thereto. If, on the other hand, the operating lever 39 is moved to the right, the lower ends of the truck legs will retract or move away from each other to thereby lower the truck and its associated beam section. I

Pivoted to the bracket 35 by a pin 51 is a forwardly extending latching bar 52 provided intermediate its ends witha notch 53. Fastened to and bridging the left leg straps 28 as viewed in FIG. 7 is a rod 54 for engaging the notch 53 and therefore serving to hold the legs 27 in their retracted or elevated position.

Pivoted to and between the other pair of leg straps 28 by studs 55 is a cross-bar 56, and extending through a transverse hole formed therein is a rod 57. Provided on the inner end of the rod 57 is a yoke 58 straddling the bracket 35 and pivoted thereto by a pin 59. Threaded on the outer end of the rod 57 is a nut 61 and a lock nut 62. This structure therefore serves as a quickly adjustable means for limiting the expansion of the truck legs 27 and for holding them in their expanded position.

Mounted within the channel 1, intermediate its ends, is a vibrator generally designated by the reference numeral 71 (FIGS. and 9). The vibrator includes opposed brackets 72 provided with outwardly extending base flanges 73 arranged to be Secured to the bottom of the channel 1 by bolts 74. Formed on the brackets 72 are opposed, axially aligned, threaded plugs 75, and threaded thereon is an intervening tubular casing 76. Mounted in the ends of the casing 76 are axially aligned bearing races ,77, and journaled therein is a shaft 78. Journaled on the shaft 78 is an eccentric closed ended sleeve 79, and disposed between the sleeve and the shaft is a loose body 81 of shot or ball bearings. Keyed to the free end of the shaft is a pulley 82, and reeved aboutv the pulley is a drive belt 83. a

As a result of this construction, the shot 81 serves two purposes: first, as a clutch to lock the eccentric sleeve 79 to the shaft when the shaft starts to rotate; and secondly, to impart an eccentric load to the eccentric sleeve. When the momentum of the shaft has been expended, the shot becomes freed and in that condition no longer serves as a clutch.

Extending through the flanges 4 and 5 of the channel 1 are lower and upper coaxial nipples 91 and 92, and mounted thereon are rubber sleeves 93 of a length substantially greater than the combined lengths of its associated nipples 91 and 92. Mounted over the rubber sleeves .93 is a plate 94 provided with downwardly extending side flanges 95. Extending through the nipples 91 and 92 are bolts 96 seated on washers97. Disposed over each bolt 96 beneath the channel flanges are Washers 98, and surrounding each bolt beneath its washer 98 is a compression spring 99. Mounted beneath the spring 99 is a washer 101 and threaded over the lower end of the bolt 96 is a nut 102. This structure therefore serves as a resilient mounting for the plate 94.

Bolted to the plate 94 is a motor or engine 103, including a driven pulley104 over which the belt 83 is reeved so as to drive the vibrator 71. I

In the use ofthis device, the beamsections 9 and ,11 are clamped together in such overlapping relationship that their overall length will span thero'ad bed or area which has been poured with concrete and so that the wheels 31 will track on the tracks or rails "32 defining" the sides of such area. After this has'been done, the elevation of the screed trucks are adjusted so as to bring the feet 12 of the beam sections into contact with the bed of concrete. The engine is then started, and with it the vibrator, and finally the screed is propelled over the bed of concrete in the usual fashion.

It will therefore be seen that I have provided a screed, the length of which can be readily adjusted to accommodate concrete beds of various widths and each end of which can be readily and. independently raised or lowered so as to meet a variety of conditions. The construction of the screed is simple, and therefore it can be manufactured and sold at a relatively low figure.-

1. A screed comprising: a beam including first and second overlapping beam sectionsprovide'd with coplanar transversely offset screeding feet, the upper ends of said beam sections being of tubular form; a channel section disposed between the overlapping portions of said beam sections and provided along its upper edges with outwardly extending flanges overlying said beam sections; clamps securing the upper ends of said beam sections between the side walls of said channel sections and said flanges; tie rods extending through the lower portion of said channel and said beam sections; means detachably securing the ends of said tie rods to said beam sections; first and second transversely extending trucks mounted respectively on the free ends of said first and second beam sections; and a vibrator mounted on said beam.

2. A screed comprising; a beam including first and second overlapping beam sections provided with coplanar transversely oifset screeding feet, the upper ends of said beam sections being of tubular form; achannel section disposed between the overlapping portions of said sections and provided at the upper free ends of its side walls with outwardly extending flanges overlying said 'beam sections; clamps securing the upper ends of said beam sections between the side walls of said channel andsaid flanges; tie rods extending through the lower portion of said channel and through selected holes of a series of holes formed along the length of said beam sections; means securing said tie rods. tosaid beam, sections; first and second transversely extending trucks mounted respectively on the free ends of said first and second beam sections; and a vibrator mounted on said beam.

3. A screed comprising: a beam including first and second overlapping beam sections provided with coplanar transversely offsetscreeding feet, the upper ends of'said beam sections havingenlarged portions; achannel section disposed between the overlapping portions of said beam sections and provided along its ,upper edges with outwardly extending flanges overlying said beam sections; clamps securing the. upper .ends of. said beam sections between the side walls of said channel section and said flanges; tie rods extending through the lower portion of said channel and said sections; means for detachably securing the ends of said tie rods to said beam sections; first and second transversely extending trucks mounted respectively on the free ends of said first and second beam sections; and a 'vibrator-mountedon said beam.

References Cited in the. file of this patent UNITED STATES PATENTS 

